Access to fetch blocked by CORS

I’m all of a sudden getting errors that match this previous thread: CORS Policy on

This is the error:
Access to fetch at ‘’ from origin ‘’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: Redirect is not allowed for a preflight request.

Did something happen with routing at the boundary nodes again? Would love to have someone take a look.



Same problem please help and fix this issue. Many thanks.

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It appears this was dependency related for us.

We upgraded all of these from 0.10.0 to 0.10.2 and that fixed the problem we were having.
@dfinity/agent”: “0.10.2”,
@dfinity/auth-client”: “0.10.2”,
@dfinity/authentication”: “0.10.2”,
@dfinity/candid”: “0.10.2”,
@dfinity/identity”: “0.10.2”,
@dfinity/principal”: “0.10.2”

Would still love a report back from someone at Dfinity on this one though.


I’m also seeing this issue. Updating dependencies hasn’t immediately fixed the problem. Will continue looking for a solution and post here.

Our dependencies upgraded from 0.10.3 → 0.10.4 for these:
@dfinity/agent”: “0.10.4”,
@dfinity/candid”: “0.10.4”,
@dfinity/principal”: “0.10.4”,

still experiencing cors preflight issue. Also tried latest: 0.14.1 no dice.